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nsswitch: return result when nss database is locked [BZ #27343]

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Before the change nss_database_check_reload_and_get() did not populate
the '*result' value when it returned success in a case of chroot
detection. This caused initgroups() to use garage pointer in the
following test (extracted from unbound):

```

int main() {
    // load some NSS modules
    struct passwd * pw = getpwnam("root");

    chdir("/tmp");
    chroot("/tmp");
    chdir("/");
    // access nsswitch.conf in a chroot
    initgroups("root", 0);
}
```

Reviewed-by: DJ Delorie <dj@redhat.com>
This commit is contained in:
Sergei Trofimovich 2021-02-05 07:32:18 +00:00 committed by DJ Delorie
parent 921e6f4198
commit c3479fb793
1 changed files with 2 additions and 1 deletions
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3
nss/nss_database.c
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@ -398,8 +398,9 @@ nss_database_check_reload_and_get (struct nss_database_state *local,
&& (str.st_ino != local->root_ino
|| str.st_dev != local->root_dev)))
{
/* Change detected; disable reloading. */
/* Change detected; disable reloading and return current state. */
atomic_store_release (&local->data.reload_disabled, 1);
*result = local->data.services[database_index];
__libc_lock_unlock (local->lock);
__nss_module_disable_loading ();
return true;